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linux/arch/arm/mach-omap2/gpmc.c
Roger Quadros a3e83f05fb ARM: OMAP2+: GPMC: Support Software ECC scheme via DT 
For v3.14 and prior, 1-bit Hamming code ECC via software was the
default choice for some boards e.g. 3430sdp.
Commit ac65caf514 in v3.15 changed the behaviour
to use 1-bit Hamming code via Hardware using a different ECC layout
i.e. (ROM code layout) than what is used by software ECC.

This ECC layout change causes NAND filesystems created in v3.14
and prior to be unusable in v3.15 and later. So don't mark "sw" scheme
as deperecated and support it.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2014-08-25 16:15:33 -07:00

1891 lines
49 KiB
C
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/*
* GPMC support functions
*
* Copyright (C) 2005-2006 Nokia Corporation
*
* Author: Juha Yrjola
*
* Copyright (C) 2009 Texas Instruments
* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#undef DEBUG
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/ioport.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_mtd.h>
#include <linux/of_device.h>
#include <linux/mtd/nand.h>
#include <linux/pm_runtime.h>
#include <linux/platform_data/mtd-nand-omap2.h>
#include <asm/mach-types.h>
#include "soc.h"
#include "common.h"
#include "omap_device.h"
#include "gpmc.h"
#include "gpmc-nand.h"
#include "gpmc-onenand.h"
#define DEVICE_NAME "omap-gpmc"
/* GPMC register offsets */
#define GPMC_REVISION 0x00
#define GPMC_SYSCONFIG 0x10
#define GPMC_SYSSTATUS 0x14
#define GPMC_IRQSTATUS 0x18
#define GPMC_IRQENABLE 0x1c
#define GPMC_TIMEOUT_CONTROL 0x40
#define GPMC_ERR_ADDRESS 0x44
#define GPMC_ERR_TYPE 0x48
#define GPMC_CONFIG 0x50
#define GPMC_STATUS 0x54
#define GPMC_PREFETCH_CONFIG1 0x1e0
#define GPMC_PREFETCH_CONFIG2 0x1e4
#define GPMC_PREFETCH_CONTROL 0x1ec
#define GPMC_PREFETCH_STATUS 0x1f0
#define GPMC_ECC_CONFIG 0x1f4
#define GPMC_ECC_CONTROL 0x1f8
#define GPMC_ECC_SIZE_CONFIG 0x1fc
#define GPMC_ECC1_RESULT 0x200
#define GPMC_ECC_BCH_RESULT_0 0x240 /* not available on OMAP2 */
#define GPMC_ECC_BCH_RESULT_1 0x244 /* not available on OMAP2 */
#define GPMC_ECC_BCH_RESULT_2 0x248 /* not available on OMAP2 */
#define GPMC_ECC_BCH_RESULT_3 0x24c /* not available on OMAP2 */
#define GPMC_ECC_BCH_RESULT_4 0x300 /* not available on OMAP2 */
#define GPMC_ECC_BCH_RESULT_5 0x304 /* not available on OMAP2 */
#define GPMC_ECC_BCH_RESULT_6 0x308 /* not available on OMAP2 */
/* GPMC ECC control settings */
#define GPMC_ECC_CTRL_ECCCLEAR 0x100
#define GPMC_ECC_CTRL_ECCDISABLE 0x000
#define GPMC_ECC_CTRL_ECCREG1 0x001
#define GPMC_ECC_CTRL_ECCREG2 0x002
#define GPMC_ECC_CTRL_ECCREG3 0x003
#define GPMC_ECC_CTRL_ECCREG4 0x004
#define GPMC_ECC_CTRL_ECCREG5 0x005
#define GPMC_ECC_CTRL_ECCREG6 0x006
#define GPMC_ECC_CTRL_ECCREG7 0x007
#define GPMC_ECC_CTRL_ECCREG8 0x008
#define GPMC_ECC_CTRL_ECCREG9 0x009
#define GPMC_CONFIG2_CSEXTRADELAY BIT(7)
#define GPMC_CONFIG3_ADVEXTRADELAY BIT(7)
#define GPMC_CONFIG4_OEEXTRADELAY BIT(7)
#define GPMC_CONFIG4_WEEXTRADELAY BIT(23)
#define GPMC_CONFIG6_CYCLE2CYCLEDIFFCSEN BIT(6)
#define GPMC_CONFIG6_CYCLE2CYCLESAMECSEN BIT(7)
#define GPMC_CS0_OFFSET 0x60
#define GPMC_CS_SIZE 0x30
#define GPMC_BCH_SIZE 0x10
#define GPMC_MEM_END 0x3FFFFFFF
#define GPMC_CHUNK_SHIFT 24 /* 16 MB */
#define GPMC_SECTION_SHIFT 28 /* 128 MB */
#define CS_NUM_SHIFT 24
#define ENABLE_PREFETCH (0x1 << 7)
#define DMA_MPU_MODE 2
#define GPMC_REVISION_MAJOR(l) ((l >> 4) & 0xf)
#define GPMC_REVISION_MINOR(l) (l & 0xf)
#define GPMC_HAS_WR_ACCESS 0x1
#define GPMC_HAS_WR_DATA_MUX_BUS 0x2
#define GPMC_HAS_MUX_AAD 0x4
#define GPMC_NR_WAITPINS 4
/* XXX: Only NAND irq has been considered,currently these are the only ones used
*/
#define GPMC_NR_IRQ 2
struct gpmc_client_irq {
unsigned irq;
u32 bitmask;
};
/* Structure to save gpmc cs context */
struct gpmc_cs_config {
u32 config1;
u32 config2;
u32 config3;
u32 config4;
u32 config5;
u32 config6;
u32 config7;
int is_valid;
};
/*
* Structure to save/restore gpmc context
* to support core off on OMAP3
*/
struct omap3_gpmc_regs {
u32 sysconfig;
u32 irqenable;
u32 timeout_ctrl;
u32 config;
u32 prefetch_config1;
u32 prefetch_config2;
u32 prefetch_control;
struct gpmc_cs_config cs_context[GPMC_CS_NUM];
};
static struct gpmc_client_irq gpmc_client_irq[GPMC_NR_IRQ];
static struct irq_chip gpmc_irq_chip;
static int gpmc_irq_start;
static struct resource gpmc_mem_root;
static struct resource gpmc_cs_mem[GPMC_CS_NUM];
static DEFINE_SPINLOCK(gpmc_mem_lock);
/* Define chip-selects as reserved by default until probe completes */
static unsigned int gpmc_cs_map = ((1 << GPMC_CS_NUM) - 1);
static unsigned int gpmc_cs_num = GPMC_CS_NUM;
static unsigned int gpmc_nr_waitpins;
static struct device *gpmc_dev;
static int gpmc_irq;
static resource_size_t phys_base, mem_size;
static unsigned gpmc_capability;
static void __iomem *gpmc_base;
static struct clk *gpmc_l3_clk;
static irqreturn_t gpmc_handle_irq(int irq, void *dev);
static void gpmc_write_reg(int idx, u32 val)
{
writel_relaxed(val, gpmc_base + idx);
}
static u32 gpmc_read_reg(int idx)
{
return readl_relaxed(gpmc_base + idx);
}
void gpmc_cs_write_reg(int cs, int idx, u32 val)
{
void __iomem *reg_addr;
reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
writel_relaxed(val, reg_addr);
}
static u32 gpmc_cs_read_reg(int cs, int idx)
{
void __iomem *reg_addr;
reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
return readl_relaxed(reg_addr);
}
/* TODO: Add support for gpmc_fck to clock framework and use it */
static unsigned long gpmc_get_fclk_period(void)
{
unsigned long rate = clk_get_rate(gpmc_l3_clk);
if (rate == 0) {
printk(KERN_WARNING "gpmc_l3_clk not enabled\n");
return 0;
}
rate /= 1000;
rate = 1000000000 / rate; /* In picoseconds */
return rate;
}
static unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
{
unsigned long tick_ps;
/* Calculate in picosecs to yield more exact results */
tick_ps = gpmc_get_fclk_period();
return (time_ns * 1000 + tick_ps - 1) / tick_ps;
}
static unsigned int gpmc_ps_to_ticks(unsigned int time_ps)
{
unsigned long tick_ps;
/* Calculate in picosecs to yield more exact results */
tick_ps = gpmc_get_fclk_period();
return (time_ps + tick_ps - 1) / tick_ps;
}
unsigned int gpmc_ticks_to_ns(unsigned int ticks)
{
return ticks * gpmc_get_fclk_period() / 1000;
}
static unsigned int gpmc_ticks_to_ps(unsigned int ticks)
{
return ticks * gpmc_get_fclk_period();
}
static unsigned int gpmc_round_ps_to_ticks(unsigned int time_ps)
{
unsigned long ticks = gpmc_ps_to_ticks(time_ps);
return ticks * gpmc_get_fclk_period();
}
static inline void gpmc_cs_modify_reg(int cs, int reg, u32 mask, bool value)
{
u32 l;
l = gpmc_cs_read_reg(cs, reg);
if (value)
l |= mask;
else
l &= ~mask;
gpmc_cs_write_reg(cs, reg, l);
}
static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p)
{
gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG1,
GPMC_CONFIG1_TIME_PARA_GRAN,
p->time_para_granularity);
gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG2,
GPMC_CONFIG2_CSEXTRADELAY, p->cs_extra_delay);
gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG3,
GPMC_CONFIG3_ADVEXTRADELAY, p->adv_extra_delay);
gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4,
GPMC_CONFIG4_OEEXTRADELAY, p->oe_extra_delay);
gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG4,
GPMC_CONFIG4_OEEXTRADELAY, p->we_extra_delay);
gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6,
GPMC_CONFIG6_CYCLE2CYCLESAMECSEN,
p->cycle2cyclesamecsen);
gpmc_cs_modify_reg(cs, GPMC_CS_CONFIG6,
GPMC_CONFIG6_CYCLE2CYCLEDIFFCSEN,
p->cycle2cyclediffcsen);
}
#ifdef DEBUG
static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
int time, const char *name)
#else
static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
int time)
#endif
{
u32 l;
int ticks, mask, nr_bits;
if (time == 0)
ticks = 0;
else
ticks = gpmc_ns_to_ticks(time);
nr_bits = end_bit - st_bit + 1;
if (ticks >= 1 << nr_bits) {
#ifdef DEBUG
printk(KERN_INFO "GPMC CS%d: %-10s* %3d ns, %3d ticks >= %d\n",
cs, name, time, ticks, 1 << nr_bits);
#endif
return -1;
}
mask = (1 << nr_bits) - 1;
l = gpmc_cs_read_reg(cs, reg);
#ifdef DEBUG
printk(KERN_INFO
"GPMC CS%d: %-10s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
(l >> st_bit) & mask, time);
#endif
l &= ~(mask << st_bit);
l |= ticks << st_bit;
gpmc_cs_write_reg(cs, reg, l);
return 0;
}
#ifdef DEBUG
#define GPMC_SET_ONE(reg, st, end, field) \
if (set_gpmc_timing_reg(cs, (reg), (st), (end), \
t->field, #field) < 0) \
return -1
#else
#define GPMC_SET_ONE(reg, st, end, field) \
if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \
return -1
#endif
int gpmc_calc_divider(unsigned int sync_clk)
{
int div;
u32 l;
l = sync_clk + (gpmc_get_fclk_period() - 1);
div = l / gpmc_get_fclk_period();
if (div > 4)
return -1;
if (div <= 0)
div = 1;
return div;
}
int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
{
int div;
u32 l;
div = gpmc_calc_divider(t->sync_clk);
if (div < 0)
return div;
GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on);
GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off);
GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);
GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on);
GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off);
GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);
GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on);
GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off);
GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);
GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle);
GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle);
GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);
GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);
GPMC_SET_ONE(GPMC_CS_CONFIG6, 0, 3, bus_turnaround);
GPMC_SET_ONE(GPMC_CS_CONFIG6, 8, 11, cycle2cycle_delay);
GPMC_SET_ONE(GPMC_CS_CONFIG1, 18, 19, wait_monitoring);
GPMC_SET_ONE(GPMC_CS_CONFIG1, 25, 26, clk_activation);
if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
GPMC_SET_ONE(GPMC_CS_CONFIG6, 16, 19, wr_data_mux_bus);
if (gpmc_capability & GPMC_HAS_WR_ACCESS)
GPMC_SET_ONE(GPMC_CS_CONFIG6, 24, 28, wr_access);
/* caller is expected to have initialized CONFIG1 to cover
* at least sync vs async
*/
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
if (l & (GPMC_CONFIG1_READTYPE_SYNC | GPMC_CONFIG1_WRITETYPE_SYNC)) {
#ifdef DEBUG
printk(KERN_INFO "GPMC CS%d CLK period is %lu ns (div %d)\n",
cs, (div * gpmc_get_fclk_period()) / 1000, div);
#endif
l &= ~0x03;
l |= (div - 1);
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
}
gpmc_cs_bool_timings(cs, &t->bool_timings);
return 0;
}
static int gpmc_cs_enable_mem(int cs, u32 base, u32 size)
{
u32 l;
u32 mask;
/*
* Ensure that base address is aligned on a
* boundary equal to or greater than size.
*/
if (base & (size - 1))
return -EINVAL;
mask = (1 << GPMC_SECTION_SHIFT) - size;
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
l &= ~0x3f;
l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
l &= ~(0x0f << 8);
l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
l |= GPMC_CONFIG7_CSVALID;
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
return 0;
}
static void gpmc_cs_disable_mem(int cs)
{
u32 l;
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
l &= ~GPMC_CONFIG7_CSVALID;
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
}
static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size)
{
u32 l;
u32 mask;
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
*base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
mask = (l >> 8) & 0x0f;
*size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
}
static int gpmc_cs_mem_enabled(int cs)
{
u32 l;
l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
return l & GPMC_CONFIG7_CSVALID;
}
static void gpmc_cs_set_reserved(int cs, int reserved)
{
gpmc_cs_map &= ~(1 << cs);
gpmc_cs_map |= (reserved ? 1 : 0) << cs;
}
static bool gpmc_cs_reserved(int cs)
{
return gpmc_cs_map & (1 << cs);
}
static unsigned long gpmc_mem_align(unsigned long size)
{
int order;
size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
order = GPMC_CHUNK_SHIFT - 1;
do {
size >>= 1;
order++;
} while (size);
size = 1 << order;
return size;
}
static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
{
struct resource *res = &gpmc_cs_mem[cs];
int r;
size = gpmc_mem_align(size);
spin_lock(&gpmc_mem_lock);
res->start = base;
res->end = base + size - 1;
r = request_resource(&gpmc_mem_root, res);
spin_unlock(&gpmc_mem_lock);
return r;
}
static int gpmc_cs_delete_mem(int cs)
{
struct resource *res = &gpmc_cs_mem[cs];
int r;
spin_lock(&gpmc_mem_lock);
r = release_resource(res);
res->start = 0;
res->end = 0;
spin_unlock(&gpmc_mem_lock);
return r;
}
/**
* gpmc_cs_remap - remaps a chip-select physical base address
* @cs: chip-select to remap
* @base: physical base address to re-map chip-select to
*
* Re-maps a chip-select to a new physical base address specified by
* "base". Returns 0 on success and appropriate negative error code
* on failure.
*/
static int gpmc_cs_remap(int cs, u32 base)
{
int ret;
u32 old_base, size;
if (cs > gpmc_cs_num) {
pr_err("%s: requested chip-select is disabled\n", __func__);
return -ENODEV;
}
/*
* Make sure we ignore any device offsets from the GPMC partition
* allocated for the chip select and that the new base confirms
* to the GPMC 16MB minimum granularity.
*/
base &= ~(SZ_16M - 1);
gpmc_cs_get_memconf(cs, &old_base, &size);
if (base == old_base)
return 0;
gpmc_cs_disable_mem(cs);
ret = gpmc_cs_delete_mem(cs);
if (ret < 0)
return ret;
ret = gpmc_cs_insert_mem(cs, base, size);
if (ret < 0)
return ret;
ret = gpmc_cs_enable_mem(cs, base, size);
if (ret < 0)
return ret;
return 0;
}
int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
{
struct resource *res = &gpmc_cs_mem[cs];
int r = -1;
if (cs > gpmc_cs_num) {
pr_err("%s: requested chip-select is disabled\n", __func__);
return -ENODEV;
}
size = gpmc_mem_align(size);
if (size > (1 << GPMC_SECTION_SHIFT))
return -ENOMEM;
spin_lock(&gpmc_mem_lock);
if (gpmc_cs_reserved(cs)) {
r = -EBUSY;
goto out;
}
if (gpmc_cs_mem_enabled(cs))
r = adjust_resource(res, res->start & ~(size - 1), size);
if (r < 0)
r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
size, NULL, NULL);
if (r < 0)
goto out;
r = gpmc_cs_enable_mem(cs, res->start, resource_size(res));
if (r < 0) {
release_resource(res);
goto out;
}
*base = res->start;
gpmc_cs_set_reserved(cs, 1);
out:
spin_unlock(&gpmc_mem_lock);
return r;
}
EXPORT_SYMBOL(gpmc_cs_request);
void gpmc_cs_free(int cs)
{
struct resource *res = &gpmc_cs_mem[cs];
spin_lock(&gpmc_mem_lock);
if (cs >= gpmc_cs_num || cs < 0 || !gpmc_cs_reserved(cs)) {
printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
BUG();
spin_unlock(&gpmc_mem_lock);
return;
}
gpmc_cs_disable_mem(cs);
if (res->flags)
release_resource(res);
gpmc_cs_set_reserved(cs, 0);
spin_unlock(&gpmc_mem_lock);
}
EXPORT_SYMBOL(gpmc_cs_free);
/**
* gpmc_configure - write request to configure gpmc
* @cmd: command type
* @wval: value to write
* @return status of the operation
*/
int gpmc_configure(int cmd, int wval)
{
u32 regval;
switch (cmd) {
case GPMC_ENABLE_IRQ:
gpmc_write_reg(GPMC_IRQENABLE, wval);
break;
case GPMC_SET_IRQ_STATUS:
gpmc_write_reg(GPMC_IRQSTATUS, wval);
break;
case GPMC_CONFIG_WP:
regval = gpmc_read_reg(GPMC_CONFIG);
if (wval)
regval &= ~GPMC_CONFIG_WRITEPROTECT; /* WP is ON */
else
regval |= GPMC_CONFIG_WRITEPROTECT; /* WP is OFF */
gpmc_write_reg(GPMC_CONFIG, regval);
break;
default:
pr_err("%s: command not supported\n", __func__);
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(gpmc_configure);
void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs)
{
int i;
reg->gpmc_status = gpmc_base + GPMC_STATUS;
reg->gpmc_nand_command = gpmc_base + GPMC_CS0_OFFSET +
GPMC_CS_NAND_COMMAND + GPMC_CS_SIZE * cs;
reg->gpmc_nand_address = gpmc_base + GPMC_CS0_OFFSET +
GPMC_CS_NAND_ADDRESS + GPMC_CS_SIZE * cs;
reg->gpmc_nand_data = gpmc_base + GPMC_CS0_OFFSET +
GPMC_CS_NAND_DATA + GPMC_CS_SIZE * cs;
reg->gpmc_prefetch_config1 = gpmc_base + GPMC_PREFETCH_CONFIG1;
reg->gpmc_prefetch_config2 = gpmc_base + GPMC_PREFETCH_CONFIG2;
reg->gpmc_prefetch_control = gpmc_base + GPMC_PREFETCH_CONTROL;
reg->gpmc_prefetch_status = gpmc_base + GPMC_PREFETCH_STATUS;
reg->gpmc_ecc_config = gpmc_base + GPMC_ECC_CONFIG;
reg->gpmc_ecc_control = gpmc_base + GPMC_ECC_CONTROL;
reg->gpmc_ecc_size_config = gpmc_base + GPMC_ECC_SIZE_CONFIG;
reg->gpmc_ecc1_result = gpmc_base + GPMC_ECC1_RESULT;
for (i = 0; i < GPMC_BCH_NUM_REMAINDER; i++) {
reg->gpmc_bch_result0[i] = gpmc_base + GPMC_ECC_BCH_RESULT_0 +
GPMC_BCH_SIZE * i;
reg->gpmc_bch_result1[i] = gpmc_base + GPMC_ECC_BCH_RESULT_1 +
GPMC_BCH_SIZE * i;
reg->gpmc_bch_result2[i] = gpmc_base + GPMC_ECC_BCH_RESULT_2 +
GPMC_BCH_SIZE * i;
reg->gpmc_bch_result3[i] = gpmc_base + GPMC_ECC_BCH_RESULT_3 +
GPMC_BCH_SIZE * i;
reg->gpmc_bch_result4[i] = gpmc_base + GPMC_ECC_BCH_RESULT_4 +
i * GPMC_BCH_SIZE;
reg->gpmc_bch_result5[i] = gpmc_base + GPMC_ECC_BCH_RESULT_5 +
i * GPMC_BCH_SIZE;
reg->gpmc_bch_result6[i] = gpmc_base + GPMC_ECC_BCH_RESULT_6 +
i * GPMC_BCH_SIZE;
}
}
int gpmc_get_client_irq(unsigned irq_config)
{
int i;
if (hweight32(irq_config) > 1)
return 0;
for (i = 0; i < GPMC_NR_IRQ; i++)
if (gpmc_client_irq[i].bitmask & irq_config)
return gpmc_client_irq[i].irq;
return 0;
}
static int gpmc_irq_endis(unsigned irq, bool endis)
{
int i;
u32 regval;
for (i = 0; i < GPMC_NR_IRQ; i++)
if (irq == gpmc_client_irq[i].irq) {
regval = gpmc_read_reg(GPMC_IRQENABLE);
if (endis)
regval |= gpmc_client_irq[i].bitmask;
else
regval &= ~gpmc_client_irq[i].bitmask;
gpmc_write_reg(GPMC_IRQENABLE, regval);
break;
}
return 0;
}
static void gpmc_irq_disable(struct irq_data *p)
{
gpmc_irq_endis(p->irq, false);
}
static void gpmc_irq_enable(struct irq_data *p)
{
gpmc_irq_endis(p->irq, true);
}
static void gpmc_irq_noop(struct irq_data *data) { }
static unsigned int gpmc_irq_noop_ret(struct irq_data *data) { return 0; }
static int gpmc_setup_irq(void)
{
int i;
u32 regval;
if (!gpmc_irq)
return -EINVAL;
gpmc_irq_start = irq_alloc_descs(-1, 0, GPMC_NR_IRQ, 0);
if (gpmc_irq_start < 0) {
pr_err("irq_alloc_descs failed\n");
return gpmc_irq_start;
}
gpmc_irq_chip.name = "gpmc";
gpmc_irq_chip.irq_startup = gpmc_irq_noop_ret;
gpmc_irq_chip.irq_enable = gpmc_irq_enable;
gpmc_irq_chip.irq_disable = gpmc_irq_disable;
gpmc_irq_chip.irq_shutdown = gpmc_irq_noop;
gpmc_irq_chip.irq_ack = gpmc_irq_noop;
gpmc_irq_chip.irq_mask = gpmc_irq_noop;
gpmc_irq_chip.irq_unmask = gpmc_irq_noop;
gpmc_client_irq[0].bitmask = GPMC_IRQ_FIFOEVENTENABLE;
gpmc_client_irq[1].bitmask = GPMC_IRQ_COUNT_EVENT;
for (i = 0; i < GPMC_NR_IRQ; i++) {
gpmc_client_irq[i].irq = gpmc_irq_start + i;
irq_set_chip_and_handler(gpmc_client_irq[i].irq,
&gpmc_irq_chip, handle_simple_irq);
set_irq_flags(gpmc_client_irq[i].irq,
IRQF_VALID | IRQF_NOAUTOEN);
}
/* Disable interrupts */
gpmc_write_reg(GPMC_IRQENABLE, 0);
/* clear interrupts */
regval = gpmc_read_reg(GPMC_IRQSTATUS);
gpmc_write_reg(GPMC_IRQSTATUS, regval);
return request_irq(gpmc_irq, gpmc_handle_irq, 0, "gpmc", NULL);
}
static int gpmc_free_irq(void)
{
int i;
if (gpmc_irq)
free_irq(gpmc_irq, NULL);
for (i = 0; i < GPMC_NR_IRQ; i++) {
irq_set_handler(gpmc_client_irq[i].irq, NULL);
irq_set_chip(gpmc_client_irq[i].irq, &no_irq_chip);
irq_modify_status(gpmc_client_irq[i].irq, 0, 0);
}
irq_free_descs(gpmc_irq_start, GPMC_NR_IRQ);
return 0;
}
static void gpmc_mem_exit(void)
{
int cs;
for (cs = 0; cs < gpmc_cs_num; cs++) {
if (!gpmc_cs_mem_enabled(cs))
continue;
gpmc_cs_delete_mem(cs);
}
}
static void gpmc_mem_init(void)
{
int cs;
/*
* The first 1MB of GPMC address space is typically mapped to
* the internal ROM. Never allocate the first page, to
* facilitate bug detection; even if we didn't boot from ROM.
*/
gpmc_mem_root.start = SZ_1M;
gpmc_mem_root.end = GPMC_MEM_END;
/* Reserve all regions that has been set up by bootloader */
for (cs = 0; cs < gpmc_cs_num; cs++) {
u32 base, size;
if (!gpmc_cs_mem_enabled(cs))
continue;
gpmc_cs_get_memconf(cs, &base, &size);
if (gpmc_cs_insert_mem(cs, base, size)) {
pr_warn("%s: disabling cs %d mapped at 0x%x-0x%x\n",
__func__, cs, base, base + size);
gpmc_cs_disable_mem(cs);
}
}
}
static u32 gpmc_round_ps_to_sync_clk(u32 time_ps, u32 sync_clk)
{
u32 temp;
int div;
div = gpmc_calc_divider(sync_clk);
temp = gpmc_ps_to_ticks(time_ps);
temp = (temp + div - 1) / div;
return gpmc_ticks_to_ps(temp * div);
}
/* XXX: can the cycles be avoided ? */
static int gpmc_calc_sync_read_timings(struct gpmc_timings *gpmc_t,
struct gpmc_device_timings *dev_t,
bool mux)
{
u32 temp;
/* adv_rd_off */
temp = dev_t->t_avdp_r;
/* XXX: mux check required ? */
if (mux) {
/* XXX: t_avdp not to be required for sync, only added for tusb
* this indirectly necessitates requirement of t_avdp_r and
* t_avdp_w instead of having a single t_avdp
*/
temp = max_t(u32, temp, gpmc_t->clk_activation + dev_t->t_avdh);
temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
}
gpmc_t->adv_rd_off = gpmc_round_ps_to_ticks(temp);
/* oe_on */
temp = dev_t->t_oeasu; /* XXX: remove this ? */
if (mux) {
temp = max_t(u32, temp, gpmc_t->clk_activation + dev_t->t_ach);
temp = max_t(u32, temp, gpmc_t->adv_rd_off +
gpmc_ticks_to_ps(dev_t->cyc_aavdh_oe));
}
gpmc_t->oe_on = gpmc_round_ps_to_ticks(temp);
/* access */
/* XXX: any scope for improvement ?, by combining oe_on
* and clk_activation, need to check whether
* access = clk_activation + round to sync clk ?
*/
temp = max_t(u32, dev_t->t_iaa, dev_t->cyc_iaa * gpmc_t->sync_clk);
temp += gpmc_t->clk_activation;
if (dev_t->cyc_oe)
temp = max_t(u32, temp, gpmc_t->oe_on +
gpmc_ticks_to_ps(dev_t->cyc_oe));
gpmc_t->access = gpmc_round_ps_to_ticks(temp);
gpmc_t->oe_off = gpmc_t->access + gpmc_ticks_to_ps(1);
gpmc_t->cs_rd_off = gpmc_t->oe_off;
/* rd_cycle */
temp = max_t(u32, dev_t->t_cez_r, dev_t->t_oez);
temp = gpmc_round_ps_to_sync_clk(temp, gpmc_t->sync_clk) +
gpmc_t->access;
/* XXX: barter t_ce_rdyz with t_cez_r ? */
if (dev_t->t_ce_rdyz)
temp = max_t(u32, temp, gpmc_t->cs_rd_off + dev_t->t_ce_rdyz);
gpmc_t->rd_cycle = gpmc_round_ps_to_ticks(temp);
return 0;
}
static int gpmc_calc_sync_write_timings(struct gpmc_timings *gpmc_t,
struct gpmc_device_timings *dev_t,
bool mux)
{
u32 temp;
/* adv_wr_off */
temp = dev_t->t_avdp_w;
if (mux) {
temp = max_t(u32, temp,
gpmc_t->clk_activation + dev_t->t_avdh);
temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
}
gpmc_t->adv_wr_off = gpmc_round_ps_to_ticks(temp);
/* wr_data_mux_bus */
temp = max_t(u32, dev_t->t_weasu,
gpmc_t->clk_activation + dev_t->t_rdyo);
/* XXX: shouldn't mux be kept as a whole for wr_data_mux_bus ?,
* and in that case remember to handle we_on properly
*/
if (mux) {
temp = max_t(u32, temp,
gpmc_t->adv_wr_off + dev_t->t_aavdh);
temp = max_t(u32, temp, gpmc_t->adv_wr_off +
gpmc_ticks_to_ps(dev_t->cyc_aavdh_we));
}
gpmc_t->wr_data_mux_bus = gpmc_round_ps_to_ticks(temp);
/* we_on */
if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
gpmc_t->we_on = gpmc_round_ps_to_ticks(dev_t->t_weasu);
else
gpmc_t->we_on = gpmc_t->wr_data_mux_bus;
/* wr_access */
/* XXX: gpmc_capability check reqd ? , even if not, will not harm */
gpmc_t->wr_access = gpmc_t->access;
/* we_off */
temp = gpmc_t->we_on + dev_t->t_wpl;
temp = max_t(u32, temp,
gpmc_t->wr_access + gpmc_ticks_to_ps(1));
temp = max_t(u32, temp,
gpmc_t->we_on + gpmc_ticks_to_ps(dev_t->cyc_wpl));
gpmc_t->we_off = gpmc_round_ps_to_ticks(temp);
gpmc_t->cs_wr_off = gpmc_round_ps_to_ticks(gpmc_t->we_off +
dev_t->t_wph);
/* wr_cycle */
temp = gpmc_round_ps_to_sync_clk(dev_t->t_cez_w, gpmc_t->sync_clk);
temp += gpmc_t->wr_access;
/* XXX: barter t_ce_rdyz with t_cez_w ? */
if (dev_t->t_ce_rdyz)
temp = max_t(u32, temp,
gpmc_t->cs_wr_off + dev_t->t_ce_rdyz);
gpmc_t->wr_cycle = gpmc_round_ps_to_ticks(temp);
return 0;
}
static int gpmc_calc_async_read_timings(struct gpmc_timings *gpmc_t,
struct gpmc_device_timings *dev_t,
bool mux)
{
u32 temp;
/* adv_rd_off */
temp = dev_t->t_avdp_r;
if (mux)
temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
gpmc_t->adv_rd_off = gpmc_round_ps_to_ticks(temp);
/* oe_on */
temp = dev_t->t_oeasu;
if (mux)
temp = max_t(u32, temp,
gpmc_t->adv_rd_off + dev_t->t_aavdh);
gpmc_t->oe_on = gpmc_round_ps_to_ticks(temp);
/* access */
temp = max_t(u32, dev_t->t_iaa, /* XXX: remove t_iaa in async ? */
gpmc_t->oe_on + dev_t->t_oe);
temp = max_t(u32, temp,
gpmc_t->cs_on + dev_t->t_ce);
temp = max_t(u32, temp,
gpmc_t->adv_on + dev_t->t_aa);
gpmc_t->access = gpmc_round_ps_to_ticks(temp);
gpmc_t->oe_off = gpmc_t->access + gpmc_ticks_to_ps(1);
gpmc_t->cs_rd_off = gpmc_t->oe_off;
/* rd_cycle */
temp = max_t(u32, dev_t->t_rd_cycle,
gpmc_t->cs_rd_off + dev_t->t_cez_r);
temp = max_t(u32, temp, gpmc_t->oe_off + dev_t->t_oez);
gpmc_t->rd_cycle = gpmc_round_ps_to_ticks(temp);
return 0;
}
static int gpmc_calc_async_write_timings(struct gpmc_timings *gpmc_t,
struct gpmc_device_timings *dev_t,
bool mux)
{
u32 temp;
/* adv_wr_off */
temp = dev_t->t_avdp_w;
if (mux)
temp = max_t(u32, gpmc_t->adv_on + gpmc_ticks_to_ps(1), temp);
gpmc_t->adv_wr_off = gpmc_round_ps_to_ticks(temp);
/* wr_data_mux_bus */
temp = dev_t->t_weasu;
if (mux) {
temp = max_t(u32, temp, gpmc_t->adv_wr_off + dev_t->t_aavdh);
temp = max_t(u32, temp, gpmc_t->adv_wr_off +
gpmc_ticks_to_ps(dev_t->cyc_aavdh_we));
}
gpmc_t->wr_data_mux_bus = gpmc_round_ps_to_ticks(temp);
/* we_on */
if (gpmc_capability & GPMC_HAS_WR_DATA_MUX_BUS)
gpmc_t->we_on = gpmc_round_ps_to_ticks(dev_t->t_weasu);
else
gpmc_t->we_on = gpmc_t->wr_data_mux_bus;
/* we_off */
temp = gpmc_t->we_on + dev_t->t_wpl;
gpmc_t->we_off = gpmc_round_ps_to_ticks(temp);
gpmc_t->cs_wr_off = gpmc_round_ps_to_ticks(gpmc_t->we_off +
dev_t->t_wph);
/* wr_cycle */
temp = max_t(u32, dev_t->t_wr_cycle,
gpmc_t->cs_wr_off + dev_t->t_cez_w);
gpmc_t->wr_cycle = gpmc_round_ps_to_ticks(temp);
return 0;
}
static int gpmc_calc_sync_common_timings(struct gpmc_timings *gpmc_t,
struct gpmc_device_timings *dev_t)
{
u32 temp;
gpmc_t->sync_clk = gpmc_calc_divider(dev_t->clk) *
gpmc_get_fclk_period();
gpmc_t->page_burst_access = gpmc_round_ps_to_sync_clk(
dev_t->t_bacc,
gpmc_t->sync_clk);
temp = max_t(u32, dev_t->t_ces, dev_t->t_avds);
gpmc_t->clk_activation = gpmc_round_ps_to_ticks(temp);
if (gpmc_calc_divider(gpmc_t->sync_clk) != 1)
return 0;
if (dev_t->ce_xdelay)
gpmc_t->bool_timings.cs_extra_delay = true;
if (dev_t->avd_xdelay)
gpmc_t->bool_timings.adv_extra_delay = true;
if (dev_t->oe_xdelay)
gpmc_t->bool_timings.oe_extra_delay = true;
if (dev_t->we_xdelay)
gpmc_t->bool_timings.we_extra_delay = true;
return 0;
}
static int gpmc_calc_common_timings(struct gpmc_timings *gpmc_t,
struct gpmc_device_timings *dev_t,
bool sync)
{
u32 temp;
/* cs_on */
gpmc_t->cs_on = gpmc_round_ps_to_ticks(dev_t->t_ceasu);
/* adv_on */
temp = dev_t->t_avdasu;
if (dev_t->t_ce_avd)
temp = max_t(u32, temp,
gpmc_t->cs_on + dev_t->t_ce_avd);
gpmc_t->adv_on = gpmc_round_ps_to_ticks(temp);
if (sync)
gpmc_calc_sync_common_timings(gpmc_t, dev_t);
return 0;
}
/* TODO: remove this function once all peripherals are confirmed to
* work with generic timing. Simultaneously gpmc_cs_set_timings()
* has to be modified to handle timings in ps instead of ns
*/
static void gpmc_convert_ps_to_ns(struct gpmc_timings *t)
{
t->cs_on /= 1000;
t->cs_rd_off /= 1000;
t->cs_wr_off /= 1000;
t->adv_on /= 1000;
t->adv_rd_off /= 1000;
t->adv_wr_off /= 1000;
t->we_on /= 1000;
t->we_off /= 1000;
t->oe_on /= 1000;
t->oe_off /= 1000;
t->page_burst_access /= 1000;
t->access /= 1000;
t->rd_cycle /= 1000;
t->wr_cycle /= 1000;
t->bus_turnaround /= 1000;
t->cycle2cycle_delay /= 1000;
t->wait_monitoring /= 1000;
t->clk_activation /= 1000;
t->wr_access /= 1000;
t->wr_data_mux_bus /= 1000;
}
int gpmc_calc_timings(struct gpmc_timings *gpmc_t,
struct gpmc_settings *gpmc_s,
struct gpmc_device_timings *dev_t)
{
bool mux = false, sync = false;
if (gpmc_s) {
mux = gpmc_s->mux_add_data ? true : false;
sync = (gpmc_s->sync_read || gpmc_s->sync_write);
}
memset(gpmc_t, 0, sizeof(*gpmc_t));
gpmc_calc_common_timings(gpmc_t, dev_t, sync);
if (gpmc_s && gpmc_s->sync_read)
gpmc_calc_sync_read_timings(gpmc_t, dev_t, mux);
else
gpmc_calc_async_read_timings(gpmc_t, dev_t, mux);
if (gpmc_s && gpmc_s->sync_write)
gpmc_calc_sync_write_timings(gpmc_t, dev_t, mux);
else
gpmc_calc_async_write_timings(gpmc_t, dev_t, mux);
/* TODO: remove, see function definition */
gpmc_convert_ps_to_ns(gpmc_t);
return 0;
}
/**
* gpmc_cs_program_settings - programs non-timing related settings
* @cs: GPMC chip-select to program
* @p: pointer to GPMC settings structure
*
* Programs non-timing related settings for a GPMC chip-select, such as
* bus-width, burst configuration, etc. Function should be called once
* for each chip-select that is being used and must be called before
* calling gpmc_cs_set_timings() as timing parameters in the CONFIG1
* register will be initialised to zero by this function. Returns 0 on
* success and appropriate negative error code on failure.
*/
int gpmc_cs_program_settings(int cs, struct gpmc_settings *p)
{
u32 config1;
if ((!p->device_width) || (p->device_width > GPMC_DEVWIDTH_16BIT)) {
pr_err("%s: invalid width %d!", __func__, p->device_width);
return -EINVAL;
}
/* Address-data multiplexing not supported for NAND devices */
if (p->device_nand && p->mux_add_data) {
pr_err("%s: invalid configuration!\n", __func__);
return -EINVAL;
}
if ((p->mux_add_data > GPMC_MUX_AD) ||
((p->mux_add_data == GPMC_MUX_AAD) &&
!(gpmc_capability & GPMC_HAS_MUX_AAD))) {
pr_err("%s: invalid multiplex configuration!\n", __func__);
return -EINVAL;
}
/* Page/burst mode supports lengths of 4, 8 and 16 bytes */
if (p->burst_read || p->burst_write) {
switch (p->burst_len) {
case GPMC_BURST_4:
case GPMC_BURST_8:
case GPMC_BURST_16:
break;
default:
pr_err("%s: invalid page/burst-length (%d)\n",
__func__, p->burst_len);
return -EINVAL;
}
}
if ((p->wait_on_read || p->wait_on_write) &&
(p->wait_pin > gpmc_nr_waitpins)) {
pr_err("%s: invalid wait-pin (%d)\n", __func__, p->wait_pin);
return -EINVAL;
}
config1 = GPMC_CONFIG1_DEVICESIZE((p->device_width - 1));
if (p->sync_read)
config1 |= GPMC_CONFIG1_READTYPE_SYNC;
if (p->sync_write)
config1 |= GPMC_CONFIG1_WRITETYPE_SYNC;
if (p->wait_on_read)
config1 |= GPMC_CONFIG1_WAIT_READ_MON;
if (p->wait_on_write)
config1 |= GPMC_CONFIG1_WAIT_WRITE_MON;
if (p->wait_on_read || p->wait_on_write)
config1 |= GPMC_CONFIG1_WAIT_PIN_SEL(p->wait_pin);
if (p->device_nand)
config1 |= GPMC_CONFIG1_DEVICETYPE(GPMC_DEVICETYPE_NAND);
if (p->mux_add_data)
config1 |= GPMC_CONFIG1_MUXTYPE(p->mux_add_data);
if (p->burst_read)
config1 |= GPMC_CONFIG1_READMULTIPLE_SUPP;
if (p->burst_write)
config1 |= GPMC_CONFIG1_WRITEMULTIPLE_SUPP;
if (p->burst_read || p->burst_write) {
config1 |= GPMC_CONFIG1_PAGE_LEN(p->burst_len >> 3);
config1 |= p->burst_wrap ? GPMC_CONFIG1_WRAPBURST_SUPP : 0;
}
gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, config1);
return 0;
}
#ifdef CONFIG_OF
static struct of_device_id gpmc_dt_ids[] = {
{ .compatible = "ti,omap2420-gpmc" },
{ .compatible = "ti,omap2430-gpmc" },
{ .compatible = "ti,omap3430-gpmc" }, /* omap3430 & omap3630 */
{ .compatible = "ti,omap4430-gpmc" }, /* omap4430 & omap4460 & omap543x */
{ .compatible = "ti,am3352-gpmc" }, /* am335x devices */
{ }
};
MODULE_DEVICE_TABLE(of, gpmc_dt_ids);
/**
* gpmc_read_settings_dt - read gpmc settings from device-tree
* @np: pointer to device-tree node for a gpmc child device
* @p: pointer to gpmc settings structure
*
* Reads the GPMC settings for a GPMC child device from device-tree and
* stores them in the GPMC settings structure passed. The GPMC settings
* structure is initialised to zero by this function and so any
* previously stored settings will be cleared.
*/
void gpmc_read_settings_dt(struct device_node *np, struct gpmc_settings *p)
{
memset(p, 0, sizeof(struct gpmc_settings));
p->sync_read = of_property_read_bool(np, "gpmc,sync-read");
p->sync_write = of_property_read_bool(np, "gpmc,sync-write");
of_property_read_u32(np, "gpmc,device-width", &p->device_width);
of_property_read_u32(np, "gpmc,mux-add-data", &p->mux_add_data);
if (!of_property_read_u32(np, "gpmc,burst-length", &p->burst_len)) {
p->burst_wrap = of_property_read_bool(np, "gpmc,burst-wrap");
p->burst_read = of_property_read_bool(np, "gpmc,burst-read");
p->burst_write = of_property_read_bool(np, "gpmc,burst-write");
if (!p->burst_read && !p->burst_write)
pr_warn("%s: page/burst-length set but not used!\n",
__func__);
}
if (!of_property_read_u32(np, "gpmc,wait-pin", &p->wait_pin)) {
p->wait_on_read = of_property_read_bool(np,
"gpmc,wait-on-read");
p->wait_on_write = of_property_read_bool(np,
"gpmc,wait-on-write");
if (!p->wait_on_read && !p->wait_on_write)
pr_warn("%s: read/write wait monitoring not enabled!\n",
__func__);
}
}
static void __maybe_unused gpmc_read_timings_dt(struct device_node *np,
struct gpmc_timings *gpmc_t)
{
struct gpmc_bool_timings *p;
if (!np || !gpmc_t)
return;
memset(gpmc_t, 0, sizeof(*gpmc_t));
/* minimum clock period for syncronous mode */
of_property_read_u32(np, "gpmc,sync-clk-ps", &gpmc_t->sync_clk);
/* chip select timtings */
of_property_read_u32(np, "gpmc,cs-on-ns", &gpmc_t->cs_on);
of_property_read_u32(np, "gpmc,cs-rd-off-ns", &gpmc_t->cs_rd_off);
of_property_read_u32(np, "gpmc,cs-wr-off-ns", &gpmc_t->cs_wr_off);
/* ADV signal timings */
of_property_read_u32(np, "gpmc,adv-on-ns", &gpmc_t->adv_on);
of_property_read_u32(np, "gpmc,adv-rd-off-ns", &gpmc_t->adv_rd_off);
of_property_read_u32(np, "gpmc,adv-wr-off-ns", &gpmc_t->adv_wr_off);
/* WE signal timings */
of_property_read_u32(np, "gpmc,we-on-ns", &gpmc_t->we_on);
of_property_read_u32(np, "gpmc,we-off-ns", &gpmc_t->we_off);
/* OE signal timings */
of_property_read_u32(np, "gpmc,oe-on-ns", &gpmc_t->oe_on);
of_property_read_u32(np, "gpmc,oe-off-ns", &gpmc_t->oe_off);
/* access and cycle timings */
of_property_read_u32(np, "gpmc,page-burst-access-ns",
&gpmc_t->page_burst_access);
of_property_read_u32(np, "gpmc,access-ns", &gpmc_t->access);
of_property_read_u32(np, "gpmc,rd-cycle-ns", &gpmc_t->rd_cycle);
of_property_read_u32(np, "gpmc,wr-cycle-ns", &gpmc_t->wr_cycle);
of_property_read_u32(np, "gpmc,bus-turnaround-ns",
&gpmc_t->bus_turnaround);
of_property_read_u32(np, "gpmc,cycle2cycle-delay-ns",
&gpmc_t->cycle2cycle_delay);
of_property_read_u32(np, "gpmc,wait-monitoring-ns",
&gpmc_t->wait_monitoring);
of_property_read_u32(np, "gpmc,clk-activation-ns",
&gpmc_t->clk_activation);
/* only applicable to OMAP3+ */
of_property_read_u32(np, "gpmc,wr-access-ns", &gpmc_t->wr_access);
of_property_read_u32(np, "gpmc,wr-data-mux-bus-ns",
&gpmc_t->wr_data_mux_bus);
/* bool timing parameters */
p = &gpmc_t->bool_timings;
p->cycle2cyclediffcsen =
of_property_read_bool(np, "gpmc,cycle2cycle-diffcsen");
p->cycle2cyclesamecsen =
of_property_read_bool(np, "gpmc,cycle2cycle-samecsen");
p->we_extra_delay = of_property_read_bool(np, "gpmc,we-extra-delay");
p->oe_extra_delay = of_property_read_bool(np, "gpmc,oe-extra-delay");
p->adv_extra_delay = of_property_read_bool(np, "gpmc,adv-extra-delay");
p->cs_extra_delay = of_property_read_bool(np, "gpmc,cs-extra-delay");
p->time_para_granularity =
of_property_read_bool(np, "gpmc,time-para-granularity");
}
#if IS_ENABLED(CONFIG_MTD_NAND)
static const char * const nand_xfer_types[] = {
[NAND_OMAP_PREFETCH_POLLED] = "prefetch-polled",
[NAND_OMAP_POLLED] = "polled",
[NAND_OMAP_PREFETCH_DMA] = "prefetch-dma",
[NAND_OMAP_PREFETCH_IRQ] = "prefetch-irq",
};
static int gpmc_probe_nand_child(struct platform_device *pdev,
struct device_node *child)
{
u32 val;
const char *s;
struct gpmc_timings gpmc_t;
struct omap_nand_platform_data *gpmc_nand_data;
if (of_property_read_u32(child, "reg", &val) < 0) {
dev_err(&pdev->dev, "%s has no 'reg' property\n",
child->full_name);
return -ENODEV;
}
gpmc_nand_data = devm_kzalloc(&pdev->dev, sizeof(*gpmc_nand_data),
GFP_KERNEL);
if (!gpmc_nand_data)
return -ENOMEM;
gpmc_nand_data->cs = val;
gpmc_nand_data->of_node = child;
/* Detect availability of ELM module */
gpmc_nand_data->elm_of_node = of_parse_phandle(child, "ti,elm-id", 0);
if (gpmc_nand_data->elm_of_node == NULL)
gpmc_nand_data->elm_of_node =
of_parse_phandle(child, "elm_id", 0);
if (gpmc_nand_data->elm_of_node == NULL)
pr_warn("%s: ti,elm-id property not found\n", __func__);
/* select ecc-scheme for NAND */
if (of_property_read_string(child, "ti,nand-ecc-opt", &s)) {
pr_err("%s: ti,nand-ecc-opt not found\n", __func__);
return -ENODEV;
}
if (!strcmp(s, "sw"))
gpmc_nand_data->ecc_opt = OMAP_ECC_HAM1_CODE_SW;
else if (!strcmp(s, "ham1") ||
!strcmp(s, "hw") || !strcmp(s, "hw-romcode"))
gpmc_nand_data->ecc_opt =
OMAP_ECC_HAM1_CODE_HW;
else if (!strcmp(s, "bch4"))
if (gpmc_nand_data->elm_of_node)
gpmc_nand_data->ecc_opt =
OMAP_ECC_BCH4_CODE_HW;
else
gpmc_nand_data->ecc_opt =
OMAP_ECC_BCH4_CODE_HW_DETECTION_SW;
else if (!strcmp(s, "bch8"))
if (gpmc_nand_data->elm_of_node)
gpmc_nand_data->ecc_opt =
OMAP_ECC_BCH8_CODE_HW;
else
gpmc_nand_data->ecc_opt =
OMAP_ECC_BCH8_CODE_HW_DETECTION_SW;
else if (!strcmp(s, "bch16"))
if (gpmc_nand_data->elm_of_node)
gpmc_nand_data->ecc_opt =
OMAP_ECC_BCH16_CODE_HW;
else
pr_err("%s: BCH16 requires ELM support\n", __func__);
else
pr_err("%s: ti,nand-ecc-opt invalid value\n", __func__);
/* select data transfer mode for NAND controller */
if (!of_property_read_string(child, "ti,nand-xfer-type", &s))
for (val = 0; val < ARRAY_SIZE(nand_xfer_types); val++)
if (!strcasecmp(s, nand_xfer_types[val])) {
gpmc_nand_data->xfer_type = val;
break;
}
val = of_get_nand_bus_width(child);
if (val == 16)
gpmc_nand_data->devsize = NAND_BUSWIDTH_16;
gpmc_read_timings_dt(child, &gpmc_t);
gpmc_nand_init(gpmc_nand_data, &gpmc_t);
return 0;
}
#else
static int gpmc_probe_nand_child(struct platform_device *pdev,
struct device_node *child)
{
return 0;
}
#endif
#if IS_ENABLED(CONFIG_MTD_ONENAND)
static int gpmc_probe_onenand_child(struct platform_device *pdev,
struct device_node *child)
{
u32 val;
struct omap_onenand_platform_data *gpmc_onenand_data;
if (of_property_read_u32(child, "reg", &val) < 0) {
dev_err(&pdev->dev, "%s has no 'reg' property\n",
child->full_name);
return -ENODEV;
}
gpmc_onenand_data = devm_kzalloc(&pdev->dev, sizeof(*gpmc_onenand_data),
GFP_KERNEL);
if (!gpmc_onenand_data)
return -ENOMEM;
gpmc_onenand_data->cs = val;
gpmc_onenand_data->of_node = child;
gpmc_onenand_data->dma_channel = -1;
if (!of_property_read_u32(child, "dma-channel", &val))
gpmc_onenand_data->dma_channel = val;
gpmc_onenand_init(gpmc_onenand_data);
return 0;
}
#else
static int gpmc_probe_onenand_child(struct platform_device *pdev,
struct device_node *child)
{
return 0;
}
#endif
/**
* gpmc_probe_generic_child - configures the gpmc for a child device
* @pdev: pointer to gpmc platform device
* @child: pointer to device-tree node for child device
*
* Allocates and configures a GPMC chip-select for a child device.
* Returns 0 on success and appropriate negative error code on failure.
*/
static int gpmc_probe_generic_child(struct platform_device *pdev,
struct device_node *child)
{
struct gpmc_settings gpmc_s;
struct gpmc_timings gpmc_t;
struct resource res;
unsigned long base;
int ret, cs;
if (of_property_read_u32(child, "reg", &cs) < 0) {
dev_err(&pdev->dev, "%s has no 'reg' property\n",
child->full_name);
return -ENODEV;
}
if (of_address_to_resource(child, 0, &res) < 0) {
dev_err(&pdev->dev, "%s has malformed 'reg' property\n",
child->full_name);
return -ENODEV;
}
ret = gpmc_cs_request(cs, resource_size(&res), &base);
if (ret < 0) {
dev_err(&pdev->dev, "cannot request GPMC CS %d\n", cs);
return ret;
}
/*
* For some GPMC devices we still need to rely on the bootloader
* timings because the devices can be connected via FPGA. So far
* the list is smc91x on the omap2 SDP boards, and 8250 on zooms.
* REVISIT: Add timing support from slls644g.pdf and from the
* lan91c96 manual.
*/
if (of_device_is_compatible(child, "ns16550a") ||
of_device_is_compatible(child, "smsc,lan91c94") ||
of_device_is_compatible(child, "smsc,lan91c111")) {
dev_warn(&pdev->dev,
"%s using bootloader timings on CS%d\n",
child->name, cs);
goto no_timings;
}
/*
* FIXME: gpmc_cs_request() will map the CS to an arbitary
* location in the gpmc address space. When booting with
* device-tree we want the NOR flash to be mapped to the
* location specified in the device-tree blob. So remap the
* CS to this location. Once DT migration is complete should
* just make gpmc_cs_request() map a specific address.
*/
ret = gpmc_cs_remap(cs, res.start);
if (ret < 0) {
dev_err(&pdev->dev, "cannot remap GPMC CS %d to %pa\n",
cs, &res.start);
goto err;
}
gpmc_read_settings_dt(child, &gpmc_s);
ret = of_property_read_u32(child, "bank-width", &gpmc_s.device_width);
if (ret < 0)
goto err;
ret = gpmc_cs_program_settings(cs, &gpmc_s);
if (ret < 0)
goto err;
gpmc_read_timings_dt(child, &gpmc_t);
gpmc_cs_set_timings(cs, &gpmc_t);
no_timings:
if (of_platform_device_create(child, NULL, &pdev->dev))
return 0;
dev_err(&pdev->dev, "failed to create gpmc child %s\n", child->name);
ret = -ENODEV;
err:
gpmc_cs_free(cs);
return ret;
}
static int gpmc_probe_dt(struct platform_device *pdev)
{
int ret;
struct device_node *child;
const struct of_device_id *of_id =
of_match_device(gpmc_dt_ids, &pdev->dev);
if (!of_id)
return 0;
ret = of_property_read_u32(pdev->dev.of_node, "gpmc,num-cs",
&gpmc_cs_num);
if (ret < 0) {
pr_err("%s: number of chip-selects not defined\n", __func__);
return ret;
} else if (gpmc_cs_num < 1) {
pr_err("%s: all chip-selects are disabled\n", __func__);
return -EINVAL;
} else if (gpmc_cs_num > GPMC_CS_NUM) {
pr_err("%s: number of supported chip-selects cannot be > %d\n",
__func__, GPMC_CS_NUM);
return -EINVAL;
}
ret = of_property_read_u32(pdev->dev.of_node, "gpmc,num-waitpins",
&gpmc_nr_waitpins);
if (ret < 0) {
pr_err("%s: number of wait pins not found!\n", __func__);
return ret;
}
for_each_available_child_of_node(pdev->dev.of_node, child) {
if (!child->name)
continue;
if (of_node_cmp(child->name, "nand") == 0)
ret = gpmc_probe_nand_child(pdev, child);
else if (of_node_cmp(child->name, "onenand") == 0)
ret = gpmc_probe_onenand_child(pdev, child);
else if (of_node_cmp(child->name, "ethernet") == 0 ||
of_node_cmp(child->name, "nor") == 0 ||
of_node_cmp(child->name, "uart") == 0)
ret = gpmc_probe_generic_child(pdev, child);
if (WARN(ret < 0, "%s: probing gpmc child %s failed\n",
__func__, child->full_name))
of_node_put(child);
}
return 0;
}
#else
static int gpmc_probe_dt(struct platform_device *pdev)
{
return 0;
}
#endif
static int gpmc_probe(struct platform_device *pdev)
{
int rc;
u32 l;
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL)
return -ENOENT;
phys_base = res->start;
mem_size = resource_size(res);
gpmc_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(gpmc_base))
return PTR_ERR(gpmc_base);
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (res == NULL)
dev_warn(&pdev->dev, "Failed to get resource: irq\n");
else
gpmc_irq = res->start;
gpmc_l3_clk = clk_get(&pdev->dev, "fck");
if (IS_ERR(gpmc_l3_clk)) {
dev_err(&pdev->dev, "error: clk_get\n");
gpmc_irq = 0;
return PTR_ERR(gpmc_l3_clk);
}
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
gpmc_dev = &pdev->dev;
l = gpmc_read_reg(GPMC_REVISION);
/*
* FIXME: Once device-tree migration is complete the below flags
* should be populated based upon the device-tree compatible
* string. For now just use the IP revision. OMAP3+ devices have
* the wr_access and wr_data_mux_bus register fields. OMAP4+
* devices support the addr-addr-data multiplex protocol.
*
* GPMC IP revisions:
* - OMAP24xx = 2.0
* - OMAP3xxx = 5.0
* - OMAP44xx/54xx/AM335x = 6.0
*/
if (GPMC_REVISION_MAJOR(l) > 0x4)
gpmc_capability = GPMC_HAS_WR_ACCESS | GPMC_HAS_WR_DATA_MUX_BUS;
if (GPMC_REVISION_MAJOR(l) > 0x5)
gpmc_capability |= GPMC_HAS_MUX_AAD;
dev_info(gpmc_dev, "GPMC revision %d.%d\n", GPMC_REVISION_MAJOR(l),
GPMC_REVISION_MINOR(l));
gpmc_mem_init();
if (gpmc_setup_irq() < 0)
dev_warn(gpmc_dev, "gpmc_setup_irq failed\n");
/* Now the GPMC is initialised, unreserve the chip-selects */
gpmc_cs_map = 0;
if (!pdev->dev.of_node) {
gpmc_cs_num = GPMC_CS_NUM;
gpmc_nr_waitpins = GPMC_NR_WAITPINS;
}
rc = gpmc_probe_dt(pdev);
if (rc < 0) {
pm_runtime_put_sync(&pdev->dev);
clk_put(gpmc_l3_clk);
dev_err(gpmc_dev, "failed to probe DT parameters\n");
return rc;
}
return 0;
}
static int gpmc_remove(struct platform_device *pdev)
{
gpmc_free_irq();
gpmc_mem_exit();
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
gpmc_dev = NULL;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int gpmc_suspend(struct device *dev)
{
omap3_gpmc_save_context();
pm_runtime_put_sync(dev);
return 0;
}
static int gpmc_resume(struct device *dev)
{
pm_runtime_get_sync(dev);
omap3_gpmc_restore_context();
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(gpmc_pm_ops, gpmc_suspend, gpmc_resume);
static struct platform_driver gpmc_driver = {
.probe = gpmc_probe,
.remove = gpmc_remove,
.driver = {
.name = DEVICE_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(gpmc_dt_ids),
.pm = &gpmc_pm_ops,
},
};
static __init int gpmc_init(void)
{
return platform_driver_register(&gpmc_driver);
}
static __exit void gpmc_exit(void)
{
platform_driver_unregister(&gpmc_driver);
}
omap_postcore_initcall(gpmc_init);
module_exit(gpmc_exit);
static int __init omap_gpmc_init(void)
{
struct omap_hwmod *oh;
struct platform_device *pdev;
char *oh_name = "gpmc";
/*
* if the board boots up with a populated DT, do not
* manually add the device from this initcall
*/
if (of_have_populated_dt())
return -ENODEV;
oh = omap_hwmod_lookup(oh_name);
if (!oh) {
pr_err("Could not look up %s\n", oh_name);
return -ENODEV;
}
pdev = omap_device_build(DEVICE_NAME, -1, oh, NULL, 0);
WARN(IS_ERR(pdev), "could not build omap_device for %s\n", oh_name);
return PTR_RET(pdev);
}
omap_postcore_initcall(omap_gpmc_init);
static irqreturn_t gpmc_handle_irq(int irq, void *dev)
{
int i;
u32 regval;
regval = gpmc_read_reg(GPMC_IRQSTATUS);
if (!regval)
return IRQ_NONE;
for (i = 0; i < GPMC_NR_IRQ; i++)
if (regval & gpmc_client_irq[i].bitmask)
generic_handle_irq(gpmc_client_irq[i].irq);
gpmc_write_reg(GPMC_IRQSTATUS, regval);
return IRQ_HANDLED;
}
static struct omap3_gpmc_regs gpmc_context;
void omap3_gpmc_save_context(void)
{
int i;
gpmc_context.sysconfig = gpmc_read_reg(GPMC_SYSCONFIG);
gpmc_context.irqenable = gpmc_read_reg(GPMC_IRQENABLE);
gpmc_context.timeout_ctrl = gpmc_read_reg(GPMC_TIMEOUT_CONTROL);
gpmc_context.config = gpmc_read_reg(GPMC_CONFIG);
gpmc_context.prefetch_config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1);
gpmc_context.prefetch_config2 = gpmc_read_reg(GPMC_PREFETCH_CONFIG2);
gpmc_context.prefetch_control = gpmc_read_reg(GPMC_PREFETCH_CONTROL);
for (i = 0; i < gpmc_cs_num; i++) {
gpmc_context.cs_context[i].is_valid = gpmc_cs_mem_enabled(i);
if (gpmc_context.cs_context[i].is_valid) {
gpmc_context.cs_context[i].config1 =
gpmc_cs_read_reg(i, GPMC_CS_CONFIG1);
gpmc_context.cs_context[i].config2 =
gpmc_cs_read_reg(i, GPMC_CS_CONFIG2);
gpmc_context.cs_context[i].config3 =
gpmc_cs_read_reg(i, GPMC_CS_CONFIG3);
gpmc_context.cs_context[i].config4 =
gpmc_cs_read_reg(i, GPMC_CS_CONFIG4);
gpmc_context.cs_context[i].config5 =
gpmc_cs_read_reg(i, GPMC_CS_CONFIG5);
gpmc_context.cs_context[i].config6 =
gpmc_cs_read_reg(i, GPMC_CS_CONFIG6);
gpmc_context.cs_context[i].config7 =
gpmc_cs_read_reg(i, GPMC_CS_CONFIG7);
}
}
}
void omap3_gpmc_restore_context(void)
{
int i;
gpmc_write_reg(GPMC_SYSCONFIG, gpmc_context.sysconfig);
gpmc_write_reg(GPMC_IRQENABLE, gpmc_context.irqenable);
gpmc_write_reg(GPMC_TIMEOUT_CONTROL, gpmc_context.timeout_ctrl);
gpmc_write_reg(GPMC_CONFIG, gpmc_context.config);
gpmc_write_reg(GPMC_PREFETCH_CONFIG1, gpmc_context.prefetch_config1);
gpmc_write_reg(GPMC_PREFETCH_CONFIG2, gpmc_context.prefetch_config2);
gpmc_write_reg(GPMC_PREFETCH_CONTROL, gpmc_context.prefetch_control);
for (i = 0; i < gpmc_cs_num; i++) {
if (gpmc_context.cs_context[i].is_valid) {
gpmc_cs_write_reg(i, GPMC_CS_CONFIG1,
gpmc_context.cs_context[i].config1);
gpmc_cs_write_reg(i, GPMC_CS_CONFIG2,
gpmc_context.cs_context[i].config2);
gpmc_cs_write_reg(i, GPMC_CS_CONFIG3,
gpmc_context.cs_context[i].config3);
gpmc_cs_write_reg(i, GPMC_CS_CONFIG4,
gpmc_context.cs_context[i].config4);
gpmc_cs_write_reg(i, GPMC_CS_CONFIG5,
gpmc_context.cs_context[i].config5);
gpmc_cs_write_reg(i, GPMC_CS_CONFIG6,
gpmc_context.cs_context[i].config6);
gpmc_cs_write_reg(i, GPMC_CS_CONFIG7,
gpmc_context.cs_context[i].config7);
}
}
}
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